Comments by Empiric (Top 3 by date)

Reason for my vote of 2 \n Even though you solved the problem you set out to solve (genuinely pleased to see this, and well-done on your use of IDataReader), my opinion is that you are trying to push a square peg through a round hole. If you want to store large data in a way that is portable, don't use an excel file format, use a proper serialization format such as CSV or XML or JSON, or (for something with a smaller footprint but lower portability) binary serialization, or for something more exotic, try protocol buffers. If you want it human-readable, use CSV or XML. Excel is poorly suited to storing or analyzing large data sets. For analyzing them, use databases. For storing them, use databases or one of the serialization formats above. To allow them to be portable between systems or organizations, use a portable serialization format. If your data is gigantic, then consider use a more efficient/compressed format.